Ayrton Oneill
Removing thick boat bottom paint from fiberglass can be a tedious and gruesome task. There are several methods to do this, including soda blasting, sanding, chemical stripping, and scraping. Soda blasting, which uses mild abrasive powder, is a popular choice as it does not harm the hull. However, it can be expensive, with costs ranging from $45 to $75 per foot. Chemical stripping is another option, offering better control over environmental hazards, but it must be used with caution as it is sensitive to sunlight and temperature. For those on a budget, sanding is the cheapest option, but it is messy and may not be allowed in certain areas due to environmental mandates. Scraping is also an option but is very time-consuming and labour-intensive.
Characteristics and Values Table for Removing Thick Boat Bottom Paint from Fiberglass
| Characteristics | Values |
|---|---|
| Safety Precautions | Gloves, safety glasses, disposable jumpsuit, dust mask/organic-vapor respirator |
| Removal Methods | Soda blasting, sandblasting, sanding, chemical stripping, scraping, heat gun, power washing, paint strippers |
| Environmental Considerations | Toxic dust, noise, waste disposal, local regulations |
| Cost | Chemical strippers: $50-$125/gallon; Soda blasting: $45-$75/foot; Smart Strip: $52.98/gallon |
| Time | Sanding: 40 hours for a 17-foot hull; Dumond Peel Away: 60 hours for a 21-foot boat; Smart Strip: 24 hours per application |
| Ease of Use | Chemical stripping is the simplest method; Sanding is messy and labour-intensive |
| Effectiveness | Soda blasting is effective and does not damage the underlying surface; Sanding may require polishing to remove scratches |
| Surface Preparation | Ensure the surface is clean and free of old anti-fouling agents |
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What You'll Learn
Soda blasting
The cost of soda blasting varies depending on the length of the vessel and the state in which it is done. Generally, it ranges from $40 to $75 per foot, with higher rates for larger boats and in states with stricter environmental laws. Boat owners can also rent a soda-blasting machine to cut the cost by nearly half.
After soda blasting, it is recommended to lightly sand the hull to remove any remaining soda residue or partially blasted paint. This makes it easier for the epoxy barrier coat to adhere and ensures a clean surface. Overall, soda blasting is an effective and environmentally-friendly method for removing bottom paint from fiberglass boats, but it is important to take the necessary precautions and comply with local regulations.
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Chemical stripping
However, chemical stripping has some hazards and can be expensive. The chemicals used are toxic and hazardous, and must be handled and disposed of correctly, in accordance with local environmental regulations. Chemical strippers are also sensitive to direct sunlight and temperature. They work best when the boat's hull and the ambient air temperature are around 70°F (21°C); higher or lower temperatures can affect the results.
When choosing a chemical stripper, it is important to select one that is compatible with fiberglass. The product should be suitable for use on glass-reinforced plastic (GRP) surfaces, commonly known as fiberglass. It should also be free from methylene chloride, as this can be harmful. Marine Strip is a popular and effective product that is safe for use on fiberglass boats and can remove up to eight coats of paint in one application. Other products include Smart Strip, Total Strip, and CITRISTRIP.
To use a chemical stripper, follow the manufacturer's instructions carefully. Typically, the stripper is applied with a paintbrush and left to work for several hours or overnight. The chemical softens the paint, which can then be easily removed with a scraper, pressure washer, and brush. It is important to wear protective clothing and gear when working with chemical strippers, including gloves, safety glasses, and a respirator.
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Scraping
If you choose to scrape the paint, you can use a plastic putty knife with a sharpened edge. This method requires careful handling to avoid creating scratch lines on the gel coat. Minor marks in the gel coat can be sanded out and polished to become invisible.
If you are looking for a less labour-intensive method, chemical strippers can be used to remove bottom paint. However, they are sensitive to direct sunlight and work best when the boat's hull and ambient air temperature are around 70°F. Chemical strippers are also expensive, costing between $50 and $125 per gallon.
Another option is soda blasting, which is rapidly becoming the removal method of choice. This method can remove paint from a hull without causing harm to the underlying gel coat surface. While it may be more expensive than other methods, it provides better control over environmental hazards, particularly toxic dust and noise.
There are also non-toxic removal products available, such as Smart Strip, which can be effective in removing old bottom paint. However, this method still requires a significant amount of work, including multiple applications, washing the residue, and wet sanding and polishing.
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Sanding
If you decide to sand, it is important to prioritise your personal safety. Dried bottom paint is a toxic, hazardous material, so safety precautions are critical. Gloves and safety glasses are mandatory, and a disposable jumpsuit and a high-quality dust mask are also recommended.
One boat owner reported that they were able to remove all the bottom paint from the transom of their Boston Whaler boat using a putty knife with a sharpened edge. They then sanded out the minor marks in the gel coat and polished it to make them invisible. However, they gave up on doing the whole hull as it was too labour-intensive.
Another owner used a product called Smart Strip to remove very old bottom paint, which required three applications. They then washed the residue, followed by wet sanding and polishing. They estimated that it would take 40 hours of work to complete a 17-foot hull.
If you are looking to get back to a clean, new-looking fiberglass surface, soda blasting is a popular method. However, this process will still require some heavy sanding afterwards to smooth out the surface.
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Heat
Firstly, it is important to be mindful of the heat setting on the heat gun. If the heat is too high, it can scorch and damage the gelcoat of the boat. It is crucial to maintain a safe distance from the surface and work slowly to avoid overheating. Additionally, the use of a heat gun will release toxic fumes, which can be hazardous to your health. It is strongly advised to wear a heavy-duty respirator and work in a well-ventilated area to mitigate the risks associated with these fumes.
When using a heat gun, it is recommended to start from a distance and gradually move closer to the surface as the paint softens. This technique ensures that you do not accidentally damage the gelcoat. Once the paint is softened, you can use a putty knife to scrape it off. It is best to use a plastic putty knife with a sharpened edge to avoid creating scratch lines on the surface.
While heat guns can be effective, they may not work on all types of paint. Some paints, like VC Tar, may not respond as well to heat stripping. Additionally, the use of a heat gun requires skill and experience. It is important to be familiar with the gelcoat's heat resistance and work carefully to avoid damage. If you are unsure, it is recommended to consult with a professional or consider alternative methods, such as soda blasting or chemical stripping.
Overall, heat is a viable option for removing thick boat bottom paint from fibreglass, but it requires caution and proper safety measures to be effective and safe.
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Frequently asked questions
The cheapest way to remove boat bottom paint is to sand it off. However, this method is messy and can make it difficult to comply with local environmental mandates. It is also very time-consuming and labour-intensive.
The easiest way to remove boat bottom paint is to hire a professional to do it. Many marinas prefer to chemically remove bottom paint, which is the simplest method, requiring only a paintbrush and a scraper. Chemical stripping also offers better control over environmental hazards.
The fastest way to remove boat bottom paint is to use a chemical stripper, such as Owatrol Marine Strip, which can remove up to eight coats in one application. After applying the stripper, the paint will be ready to remove within 12 hours with a pressure washer and a brush.
It is important to approach bottom paint removal with personal safety in mind. Dried bottom paint is a toxic, hazardous material, so gloves, safety glasses, a disposable jumpsuit, and a high-quality dust mask or organic-vapor respirator are essential.
